JP2020024845A - Method for controlling ionic wind generator - Google Patents

Abstract

To provide a method for controlling an ionic wind generator, the method capable of achieving an ionic wind with a high body force using low electric power.SOLUTION: A method for controlling an ionic wind generator is provided in which a distance A between a first electrode layer 12 and a third electrode layer 16 is 11 to 35 mm. An AC voltage applied to the first electrode layer 12 by an AC power source 20 is set to 6 to 20 kVpp, and a DC voltage applied to a second electrode layer 14 or the third electrode layer 16 by a DC power source 30 is set to 6 to 20 kV.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for controlling an ion wind generator.

  In a metal electrode / insulator / metal electrode configuration, it is known that air is charged by applying a voltage between the metal electrodes to generate ion wind.

  In Patent Literature 1, at least one of two electrodes provided on both surfaces of a planar dielectric is formed of an electrode having a multi-point end, an AC voltage is applied to both electrodes, and one of them is grounded. There is taught an airflow generator characterized by inducing ion wind. According to Patent Document 1, such an airflow generating device has the following effects. (1) By applying a high voltage to one of the electrodes, plasma is induced to a grounded electrode existing on the opposite surface with the planar dielectric material interposed therebetween. (2) By applying an AC voltage to the electrode, the form of the plasma is stabilized, and at the same time, a blowing force from the electrode to the plate-like ground electrode is induced on the planar dielectric, and It is mentioned above that it has the effect of generating an ionic wind.

  Further, such ionic wind is also used as heat exchange means. For example, in Patent Document 2, an electron-emitting device having an electrode substrate, a thin-film electrode, and an electron acceleration layer sandwiched between them, and a hole having at least one through hole facing the thin-film electrode at a distance from the thin-film electrode An electron-emitting device and a hole electrode are placed in the air, a first voltage is applied between the electrode substrate and the thin-film electrode, and a second voltage is applied between the thin-film electrode and the hole electrode When the first voltage is applied, electrons generated on the electrode substrate are accelerated by the electron acceleration layer and released into the air from the thin film electrode to generate negative ions, and the second voltage generates an ion wind containing the negative ions. There is disclosed a heat exchange device configured to be discharged to a heat exchange target through a through hole.

  In recent years, a three-electrode ion wind generator has also been proposed.

  Non-Patent Document 1 discloses that a plasma actuator having a three-electrode configuration applies AC 15.6 kVpp and DC 0 to 30 kV at a frequency of 6 kHz, 7 kHz, 13 to 18 kHz. It is also disclosed that the distance between the AC electrode and the DC electrode is 40 mm, 60 mm, and 80 mm.

  Non-Patent Document 2 discloses that a plasma actuator having a three-electrode configuration applies an AC of 10.4 to 20.8 kV and a DC of 0 to 20 kV. It also discloses that the distance between the AC electrode and the DC electrode is 40 mm.

JP 2009-247966 A JP 2013-077750 A

Proceedings of the 2017 Annual Meeting of the Japan Society of Mechanical Engineers NO. 17-1, S0530102 2012-3238.6th-AIAA Flow Control Conference, 25-28 June 2012

  There is room for improvement regarding both the increase in the wind speed (body force) of the ion wind and the reduction in power consumption when generating the ion wind.

  Therefore, there is a need to provide a method for controlling an ion wind generator that can obtain an ion wind having a high body force with low power.

Means for Solving the Problems The present inventors have conducted intensive studies and found that the above-mentioned problems can be solved by the following means, and completed the present invention. That is, the present invention is as follows:
<Aspect 1> A method for controlling an ion wind generator,
The ion wind generator,
Equipped with an electrode body, an AC power supply and a DC power supply,
The electrode body has a first electrode layer, a second electrode layer, a third electrode layer, and a dielectric layer, and the AC power supply is connected between the first electrode layer and the second electrode layer. Voltage can be applied between these electrode layers,
The DC power source is connected between the second electrode layer and the third electrode layer, whereby a voltage can be applied between these electrode layers;
The first and third electrode layers are disposed to face a part of one surface of the dielectric layer substantially in parallel,
The distance between the first electrode layer and the third electrode layer is 11 to 35 mm,
The second electrode layer is disposed on a part of the other surface of the dielectric layer,
Thereby, a voltage was applied between the first electrode layer and the second electrode layer by the AC power supply, and a voltage was applied between the second electrode layer and the third electrode layer by the DC power supply. Sometimes, it is possible to generate ion wind in a direction away from the dielectric layer,
It is an ion wind generator,
An AC voltage applied between the first electrode layer and the second electrode layer by the AC power supply is set to 6 to 20 kVpp, and between the second electrode layer and the third electrode layer by the DC power supply. DC voltage to be applied is set to 6 to 20 kV,
Control method of ion wind generator.
<Aspect 2> The method for controlling an ion wind generator according to Aspect 1, wherein the AC voltage is 11 to 20 kVpp.

  ADVANTAGE OF THE INVENTION According to this invention, the control method of the ion wind generator which can obtain the ion wind with high body force with low electric power can be provided.

FIG. 1 is a schematic diagram of an ion wind generator. FIG. 1A shows a side sectional view of the ion wind generator, and FIG. 1B shows a top view of the ion wind generator. FIG. 2 is a conceptual diagram of generation of ion wind by the ion wind generator. FIG. 3 is a diagram illustrating the relationship between the body force of the ion wind and the absolute value of the potential of the third electrode layer under the control conditions of Examples 1-1 to 1-4 and Comparative Example 3-1.

《Control method of ion wind generator》
Referring to FIG. 1 which is an exemplary embodiment, the control method of the ion wind generator of the present invention is as follows.
Ion wind generator 100,
Comprising an electrode body 10, an AC power supply 20 and a DC power supply 30,
The electrode body 10 has a first electrode layer 12, a second electrode layer 14, a third electrode layer 16, and a dielectric layer 18, and the AC power supply 20 Between the electrode layers, so that a voltage can be applied between these electrode layers,
A DC power supply 30 is connected between the second electrode layer 14 and the third electrode layer 16 so that a voltage can be applied between these electrode layers;
The first electrode layer 12 and the third electrode layer 16 are disposed substantially parallel to and opposed to a part of one surface of the dielectric layer,
The distance A between the first electrode layer 12 and the third electrode layer 16 is 11 to 35 mm,
A second electrode layer disposed on a portion of the other surface of the dielectric layer;
Thereby, a voltage was applied between the first electrode layer 12 and the second electrode layer 14 by the AC power supply 20, and a voltage was applied between the second electrode layer 14 and the third electrode layer 16 by the DC power supply 30. Sometimes, an ion wind can be generated in a direction away from the dielectric layer 18,
It is an ion wind generator,
An AC voltage applied between the first electrode layer 12 and the second electrode layer 14 by the AC power supply 20 is set to 6 to 20 kVpp, and a DC power supply 30 DC voltage to be applied is set to 6 to 20 kV,
It is a control method of the ion wind generator.

  The present inventors have found that an ion wind having a high body force can be obtained with low power by the above method. While not wishing to be bound by theory, an AC voltage is applied between the first and second electrode layers with the distance between the first and third electrode layers being 11 to 35 mm. When applied, as shown in FIG. 2A, an electric field film X is formed between the first electrode layer 12 and the third electrode layer 16, and as a result, ionization of molecules in the air is promoted and ions are formed. It is thought to be deposited. In this state, when a DC voltage is applied between the second electrode layer and the third electrode layer, as shown in FIG. 2 (b), the ions are repelled by the DC voltage, and even at a weak DC voltage, the body force is reduced. It is considered that a high ion wind can be obtained.

  The AC voltage (peak to peak) applied between the first electrode layer and the second electrode layer by the AC power supply is preferably 11 kVpp or more, 12 kVpp or more, or 13 kVpp or more. It is preferable from the viewpoint of forming the same, and preferably 20 kVpp or less, 17 kVpp or less, or 15 kVpp or less from the viewpoint of suppressing energy consumption.

  The DC voltage applied between the second electrode layer and the third electrode layer by the DC power supply is 6 kV or more, 8 kV or more, 9 kV or more, 10 kV or more, or 11 kV or more, which increases the ionic wind body force. It is preferable from the viewpoint, and preferably from 20 kVpp or less, 17 kVpp or less, 15 kVpp or less, or 13 kVpp or less from the viewpoint of suppressing energy consumption.

  It is preferable to electrically ground the second electrode layer from the viewpoint of safety.

  The first electrode layer and the third electrode layer are arranged to face substantially in parallel. Here, in the present invention, “substantially parallel” means that the angle difference with respect to perfect parallelism is within 10 °, 5 °, 3 °, or 1 °.

  The distance between the first electrode layer and the third electrode layer is preferably 11 mm or more, 13 mm or more, 15 mm or more, or 18 mm or more, from the viewpoint of suppressing short-circuit discharge when an AC voltage is applied, and It is preferable that the thickness be 35 mm or less, 33 mm or less, 30 mm or less, 27 mm or less, 25 mm or less, or 22 mm or less, particularly 20 mm, from the viewpoint of favorably forming the above-mentioned electric field film by AC voltage.

  The lengths of the first and third electrode layers may be different from each other or may be equal to each other, but are preferably equal to each other from the viewpoint of manufacturing.

  It is preferable that the second electrode layer is disposed at a position corresponding to a region between the first electrode layer and the third electrode layer, from the viewpoint of favorably forming the above-mentioned electrolytic film by an AC voltage.

  Hereinafter, each configuration of the ion wind generator used in the method of the present invention will be described.

<Electrode body>
The electrode body has a first electrode layer, a second electrode layer, a third electrode layer, and a dielectric layer.

(First electrode layer)
The first electrode layer is an electrode layer connected to an AC power supply, for example, a strip-shaped electrode layer.

  The first electrode layer may be made of a material exhibiting conductivity, and may be, for example, a metal such as zinc, aluminum, gold, silver, copper, platinum, nichrome, iridium, tungsten, nickel, and iron. As the first electrode layer, a conductive ink such as a silver paste or a carbon paste, which is blended with a polyester resin, an epoxy resin, a polyurethane resin, a PVC resin, a phenol resin, or the like can be used. .

(Second electrode layer)
The second electrode layer is connected to an AC power supply and a DC power supply, and is preferably an electrically grounded electrode layer, for example, a strip-shaped electrode layer. The second electrode layer may be composed of the materials listed for the first electrode layer.

(Third electrode layer)
The third electrode layer is an electrode layer connected to a DC power supply, for example, a strip-shaped electrode layer. The third electrode layer may be composed of the materials listed for the first electrode layer.

(Dielectric layer)
An arbitrary insulator can be used as the dielectric layer, and for example, mica, glass, ceramic, resin, or the like can be used. The dielectric layer may be, for example, a sheet-shaped dielectric layer.

  As the ceramic, for example, alumina, zirconia silicon nitride, aluminum nitride, or the like can be used.

  As the resin, for example, phenol resin, urea resin, polyester, epoxy, silicone, polyethylene, polytetrafluoroethylene, polystyrene, soft embi, hard embi, cellulose acetate, polyethylene terephthalate, Teflon (registered trademark), raw rubber, soft rubber, Ebonite, steatite, butyl rubber, neoprene and the like can be used.

<AC source>
The AC power supply is an AC power supply that is connected between the first electrode layer and the second electrode layer, so that a voltage can be applied between these electrode layers. As the AC power supply, any AC power supply that can apply an AC voltage of 6 to 20 kVpp can be used.

<DC power supply>
A DC power supply is connected between the second electrode layer and the third electrode layer, whereby a DC power supply can apply a voltage between these electrode layers. As the DC power supply, any DC power supply can be used as long as the DC power supply can apply a DC voltage of 6 to 20 kV.

  The present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these.

<< Making of ion wind generator >>
<Example 1>
As shown in FIG. 1, on one surface of a polytetrafluoroethylene sheet (60 mm × 60 mm, thickness 1 mm) as the dielectric layer 18, an aluminum tape (width) as the first electrode layer 12 and the third electrode layer 16 is provided. 5 mm, length 35 mm) were arranged in parallel at intervals of 20 mm. In Tables 1 to 4 below, the distance between the first electrode layer and the third electrode layer is referred to as “distance between electrodes”.

  Next, at the position corresponding to the region between the first electrode layer 12 and the third electrode layer 16 on the other surface of the polytetrafluoroethylene sheet, an aluminum tape (width 20 mm, length 35 mm).

  Next, an AC power supply is connected between the first electrode layer and the second electrode layer, a DC power supply is connected between the second electrode layer and the third electrode layer, and the second electrode layer is electrically grounded. Thus, the ion wind generator of Example 1 was manufactured. The DC power supply was connected such that the negative electrode terminal was on the third electrode layer side.

<Example 2>
An ion wind generator of Example 2 was produced in the same manner as in Example 1, except that the positive electrode terminal of the DC power supply was on the third electrode layer side.

<Comparative Examples 1-2>
Comparative examples were obtained in the same manner as in Examples 1 and 2, except that the distance between the first electrode layer 12 and the third electrode layer 16 was changed to 10 mm, and the width of the second electrode layer 14 was changed to 10 mm. 1-2 ion wind generators were produced.

<Comparative Example 3>
Except that the distance between the first electrode layer 12 and the third electrode layer 16 was changed to 40 to 80 mm, and the width of the second electrode layer 14 was changed to 40 to 80 mm according to this distance, Similarly, an ion wind generator of Comparative Example 3 was produced.

《Evaluation》
The potential of the first and third electrode layers was changed within the range shown in Table 1, and the body force of the ion wind was measured. The measurement of the body force of the ion wind was performed by arranging each ion wind generator on an electronic balance and measuring the reaction force when the ion wind was generated by the electronic balance.

  Control conditions and evaluation results are shown in Tables 1 to 4 and FIG. In addition, in Tables 1-4, "GND" (ground) means that it is electrically grounded. The fact that the potential of the third electrode layer indicates a negative value means that the negative electrode terminal of the DC power supply is connected to the third electrode.

  Table 1 shows the maximum body force of the ion wind when the potentials of the first and third electrode layers are changed in the range shown in Table 1.

  In Table 2, for the ion wind generator of Example 1, the potential of the first electrode layer was set to 11 kVpp, 14 kVpp, 17 kVpp, and 20 kVpp while the potential of the third electrode layer was changed to reduce the body force of the ion wind. Those evaluated individually are referred to as Examples 1-1 to 1-4, respectively.

  Table 3 shows that the ion wind generator of Comparative Example 3 was evaluated individually for the body force of the ion wind by changing the potential of the third electrode layer while fixing the distance between the electrodes to 40 mm. -1.

  FIG. 3 shows the relationship between the body force of the ion wind shown in Tables 2 and 3 and the absolute value of the potential of the third electrode layer.

  In Table 4, without applying a DC voltage between the second electrode layer and the third electrode layer, what individually evaluated the body force of the ionic wind when the potential of the first electrode layer was changed, Reference is made to Examples 1-5.

  From Table 1, the ion wind generators of Examples 1 and 2 in which the distance between the electrodes is 20 mm are the ion wind generators of Comparative Examples 1 and 2 in which the distance between the electrodes is 10 mm, and Comparative Example 3 in which the distance between the electrodes is 40 mm. It can be seen that the maximum body force of the ion wind is significantly larger than that of the ion wind generator.

  Further, from Tables 2 and 3 and FIG. 3, the ion wind generators of Examples 1-1 to 1-4 and Comparative Example 3-1 show that when the absolute value of the potential of the third electrode layer increases, the volume of the ion wind increases. Although they are common in that the force is increased, the ion wind generator of Comparative Example 3 generates ion wind when the absolute value of the potential of the third electrode is 15 kV or more. It can be understood that the ion wind generators 1-1 to 1-4 generate ion wind when the absolute value of the potential of the third electrode is 6 kV or more. From this, it can be understood that the ion wind generators of Examples 1-1 to 1-4 can obtain higher ionic wind volume force with lower power than the ion wind generator of Comparative Example 3.

  In addition, although individual evaluations as in Examples 1-1 to 1-4 are not explicitly described, even in the case of the ion wind generator of Example 2, the evaluation is as high as in Examples 1-1 to 1-4. The body force of the ion wind was obtained.

  Also, comparing the ion wind generators of Examples 1-1 to 1-4, it can be understood that the smaller the potential of the first electrode layer, the higher the volume force of the ion wind can be obtained.

  From Table 4, it can be confirmed that when only the AC voltage is applied, almost no ionic wind is generated. From this, it can be confirmed that the interaction between the AC voltage and the DC voltage contributes to the generation of the ionic wind. Like.

Reference Signs List 10 electrode body 12 first electrode layer 14 second electrode layer 16 third electrode layer 18 dielectric layer 20 AC power supply 30 DC power supply 100 ion wind generator A Distance between first electrode layer and second electrode layer X electric field Coating Y Ion wind

Claims (2)

A method for controlling an ion wind generator, comprising:
The ion wind generator,
Equipped with an electrode body, an AC power supply and a DC power supply,
The electrode body has a first electrode layer, a second electrode layer, a third electrode layer, and a dielectric layer, and the AC power supply is connected between the first electrode layer and the second electrode layer. Voltage can be applied between these electrode layers,
The DC power source is connected between the second electrode layer and the third electrode layer, so that a voltage can be applied between these electrode layers;
The first and third electrode layers are disposed to face a part of one surface of the dielectric layer substantially in parallel,
The distance between the first electrode layer and the third electrode layer is 11 to 35 mm,
The second electrode layer is disposed on a part of the other surface of the dielectric layer,
Thereby, a voltage was applied between the first electrode layer and the second electrode layer by the AC power supply, and a voltage was applied between the second electrode layer and the third electrode layer by the DC power supply. Sometimes, an ionic wind can be generated in a direction away from the dielectric layer,
It is an ion wind generator,
An AC voltage applied between the first electrode layer and the second electrode layer by the AC power supply is set to 6 to 20 kVpp, and between the second electrode layer and the third electrode layer by the DC power supply. DC voltage to be applied is set to 6 to 20 kV,
Control method of ion wind generator.   The method for controlling an ion wind generator according to claim 1, wherein the AC voltage is set to 11 to 20 kVpp.

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